Acts 20:31

Therefore watch, remembering that for three years, by day and by night, I ceased not to warn every one of you with tears.

1 Thessalonians 5:14

We exhort you, brethren, admonish the unruly, comfort the faint-hearted, earnestly care for the weak-minded, be of a long-suffering disposition toward all.

Treasury of Scripture Knowledge

Summary

And what cause soever shall come to you of your brethren that dwell in their cities, between blood and blood, between law and commandment, statutes and judgments, ye shall even warn them that they trespass not against the LORD, and so wrath come upon you, and upon your brethren: this do, and ye shall not trespass.

Bible References

Warn them

Acts 20:31
Therefore watch, remembering that for three years, by day and by night, I ceased not to warn every one of you with tears.
1 Thessalonians 5:14
We exhort you, brethren, admonish the unruly, comfort the faint-hearted, earnestly care for the weak-minded, be of a long-suffering disposition toward all.